Saw and chisel gummer.



UNITED STATES PATENT or'ncn.

SAW AND CHISEL GUMIVIER.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed June 22, 1903. Serial No. 162,677.

To all whom, it may concern:

Be it known that I, BURT F. FRoNEY, a citizen of the United States, residing at Jacobsville, in the county of Houghton and State of Michigan, have invented a new and useful Saw and Chisel Gummer, of which the following is a specification.

The invention relates to improvements in saw and chisel gurnmers.

The object of the present invention is to improve the construction of saw and chisel gummers by providing a simple and inexpensive one of great strength and durability, designed particularly for carpenters, stone-cutters, and other mechanics, constructed so as to be conveniently carried in a tool-chest, and capable of being readily operated to cut a saw-blade or a toothed chisel to increase the size of the interdental recesses or notches.

A further object of the invention is to provide a saw-gummer capable of making a clean shear cut to avoid all liability of breaking or cracking a saw-blade or tool and adapted to begin the cutting or shearing operation at the inner or heavier portion of a tapered cutting member, whereby the cutting is rendered easy and the point of the tapered member is prevented from breaking.

Another object of the invention is to provide a saw-gummer adapted to be readily set for cutting teeth of different sizes and capable of automatically freeing itself from a sawblade or tool after each cutting operation.

With these and other objects in view the invention consists in the construction and novel combination and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and pointed out in the claims hereto appended, it being understood that various changes in the form, proportion, size, and minor details of construction within the scope of the claims may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Figure 1 is a perspective view of a sawgummer constructed in accordance with this invention. Fig. 2 is a longitudinal sectional view of the same. Fig. 3 is a transverse sectional view on the line 3 3 of Fig. 2. Fig. 4 is a detail perspective view of the pivoted cutting member. Fig. 5 is a detail view illustrating a slight modification of the base-plate or die.

Like numerals of reference designate corresponding parts in all the figures of the draw- 1ngs.

1 designates a base or bed plate designed to be constructed of hard steel or other suitable material, and it forms the lower member or die of the saw-gummer. It is provided with a longitudinal slot or opening 2, extending forward from the rear end of the plate or member, terminating short of'the front end thereof and adapted to receive a pivoted cutting member 3. The front end of the slot or opening 2 is l\-shaped, and the side walls of the /\-shaped portion constitute cutting edges. The base-plate is designed to be mounted on and secured to a bench or other suitable support, and it is provided at opposite sides of the longitudinal opening with countersunk perforations for the reception of wood-screws 4 for securing it to the bench or other support. The metal is designed to be tempered very hard at the front end of the longitudinal slot or opening to provide lower cutting edges 5; but the lower member or base maybe constructed of malleable cast-iron or other suitable material, and when so constructed it will be provided at the front end of the longitudinal slot or opening with a steel plate 6, having beveled edges and arranged in a dovetailed groove 7 and forming a die. The plate 6 is provided at its inner or rear edge with a V-shaped notch or recess 8, registering with the front portion of the longitudinal slot or opening of the lower member or base.

The pivoted bar or member3 is provided with an eccentrically arranged transverse opening 9 for the reception of a pivot or pin 10, which is also arranged in suitable bearings 11 of adjustable plates 12, located at opposite sides of the longitudinal opening of the base 1, as clearly shown in Figs. 1 and 3 of the drawings. Thebearing-plates12areprovided at their front portions with longitudinal slots 13 for the reception of bolts 14 or other suitable fastening devices, which are mounted on and extend upward from the base 1. The bolts 14 are provided with nuts 15 and are adapted to clamp the bearing-plates firmly at any desired adjustment and are capable of en abling the pivoted bar or member to be adjusted for a purpose hereinafter explained. The rear portions of the bearing-plates are provided at their lower faces with hearingrecesses to receive the end portions of the pivot or pin.

The pivoted cutting member 3, which is arranged within the slot or opening of the lower member or base, has front and rear portions arranged at a slight angle, as shown in Fig. 2,

and the pivot-opening 9 is eccentrically arranged to provide a weighted rear portion, which is adapted to hold the front end of the pivoted cutting member normally elevated, and it is also adapted to swing the front end of the pivoted member upward aut matically after each cut to clear the said front end of the saw-blade or tool and to facilitate feeding the same. The lower portion of the front arm of the pivoted cutting member is recessed at opposite sides to provide a tapered cutting portion 16, with overhanging flanges, and the cutting port-ion, which varies in width to cut teeth of the desired shape, is also tapered vertically to provide a tapered or sloping lower face, which is arranged at an inclination when the parts are in their normal position, as illustrated in Figs. 1 and 2 of the drawings, whereby when a saw-blade is inserted between the cutting edges of the upper and lower members the cutting action will begin at the inner or heavier portion of the tapered cutting part of the pivoted member 3, thus rendering the cutting operation easy and protecting the point to prevent the same from being broken. This arrangement also produces a shear cut and prevents a saw-blade from cracking or breaking when acted on by the saw-gummer. The front end of the pivoted member of the saw-gummer is struck with a hammer, thereby forcing the tapered cutting portion downward and making the necessary cut in a sawblade or tool. When the tapered cutting portion of the pivoted bar or member is worn down, it may be reground. The slotted bearing-plates and the fastening devices will permit the pivoted bar or member to be advanced in the longitudinal slot or opening 2 to bring the tapered cutting portion in proper position with relation to the tapered front portion of the slot or opening. The intermediate and rear portions of the pivoted cutting bar or member are arranged partially within the slot or opening 2, and this arrangement cooperates with the upright taper of the cutting portion 16 to bring the lower face of the cutting portion 16 in proper position to operate on a sawblade or tool, as before explained. Furthermore, the pivoted cutting member is supported by the sides of the base 1, thereby enabling the cutting to be effected with great accuracy.

The pivoted cutting bar or member is provided at its rear end with an adjustable screw 17, adapted to be readily adjusted to position the front end of the pivoted cutting bar or member properly with relation to the bedplate 1. By adjusting the screw the device may be readily set for cutting an interdental notch or recess of the desired depth.

The pivoted cutting bar or member is designed to be constructed of hard steel and to be tempered at the point where its cutting edges cooperate with the cutting edges of the lower member or base; but a steel die or plate may be mounted on the upper bar or member, and the latter may then be constructed of material other than tool-steel. The plates 12 are designed to be constructed of malleable castiron, and the pin or pivot will be constructed of steel; but the parts of the device may be constructed of any desired material, as will be readily understood.

It will be seen that the saw-gummer is exceedingly simple and inexpensive in construction, that it is not liable to become broken or otherwise get out of order, and that when it becomes necessary to grind down the lower tapered cutting portion of the pivoted cutting member the latter may be adjusted forwardly to advance the cutting portionin the longitu-' dinal opening of the lower member or base to arrange the upper and lower cutting edges in proper relative position. Furthermore, it will be seen that the lower cutting portion of the pivoted cutting member has a double taper and that the cutting operation commences at the heavier or inner portion of the lower tapered cutting portion, whereby the cutting operation is rendered easy and the point of the tapered portion protected and prevented from breaking when the upper portion of the pivoted cutting member is subjected to a heavy blow. Also it will be clear that by loosely pivoting the upper cutting member in the longitudinal opening of the lower member or base and arranging the pivot eccentrically the upper cutting member is adapted to clear itself automatically from a saw-blade or tool at the completion of each cutting operation, thereby enabling the saw-blade or toolto be fed more rapidly to the gummer and facilitating a rapid operation thereof. By arranging the body portion of the pivoted cutting member within the longitudinal opening of the lower member or base the former is guided and prevented from moving laterally, thereby insuring great accuracy in the cutting operation and at the same time increasing the durability of the device. This arrangement also enables the inclined lower face of the tapered portion of the cutting member 3 to be arranged close to the upper face of the lower member or base to cause the cutting operation to begin at a strong heavy portion of the pivoted cutting member. The adjusting-screw, which depends from the rear or heavier arm of the pivoted cutting member, enables the device to be set for cutting teeth of the desired length, and by this means the saw-gummer is adapted to be rapidly operated by striking the upper face of the front arm of the pivoted cutting member with a hammer. The top of the front arm of the pivoted cutting member extends laterally beyond the sides of the bottom cutting portion and is arranged to engage the upper face of the base, the tapered bottom cutting portion coming in contact only with the material operated on and not with the base.

What I claim is 1. In a device of the class described, a baseplate provided with a longitudinal slot which extends from one end of the plate nearly to the opposite end thereof, the closed end of the slot being A-shaped and the walls thereof at the closed end constituting cutting edges, in combination with a cutting member arranged partly within the slot of the base-plate for a portion of its length and having its operative end recessed to provide alower cutting portion with flanges which overhang the walls of the slot, said cutting portion being tapered to a point to cooperate with the I\-shaped end of the slot of the base, and having its lower face beveled upwardly to provide a shear cut, causing the cutting operation to begin at the inner end of the cutting portion of the beveled member, and said cutting member being pivoted at an intermediate point of its length and also intermediate of the length of the baseplate, substantially as described.

2. A device of the class described comprising a base-plate provided with alongitudinal slot, the walls thereof at one end of the same constituting cutting edges, in combination with a cutting member pivoted at an intermediate point of its length and also intermediate of the length of the base, the opposite ends of the cutting member being arranged at an angle to each other, the cutting member being of less length than the base-plate and having a heavier rear portion adapted to hold the front portion normally elevated above the base-plate, and an adjustable device for limiting the upward swing of the front portion of the pivoted cutting member, substantially as described.

3. A device of the class described comprising a base having a longitudinal opening, and a longitudinally-adjustable pivoted cutting member having the greater portion of it arranged within the opening of the base, said pivoted cutting member having front and-rear arms arranged at an angle to each other, substantially as described.

4. A device of the class described comprising a base having a longitudinal opening tapered at the front portion, and a pivoted cutting member having its greater portion arranged within the opening, and cut away at opposite sides of the bottom of its front portion to provide a tapered cutting portion to fit the said opening, the top of the front portion of the cutting member being extended laterally beyond the tapered cutting portion and adapted to receive the blows of a hammer and arranged to engage the base, substantially as described.

5. A device of the class described comprising a base, adjustable bearing-plates mounted on the base, and a cutting member having a cutting portion and provided with a pivot arranged in the bearing-plates, whereby the cutting member is capable of adjustment longitudinally of the base, substantially as described.

6. In a device of the class described, a baseplate provided with a longitudinal slot which extends from one end of the plate nearly to the opposite end thereof, the closed end of the slot being l\-shaped, and the walls thereof at the closed end constituting cutting edges, in combination with a cutting member arranged partly within the slot of the base-plate and having its inner end tapered to a point to cooperate with the A-shaped end of the slot of the base, and having its lower face beveled upwardly to provide a shear cut, thereby causing the cutting operation to begin at the inner end of the cutting portion of the cutting member.

In testimony that I claim the foregoing as my own I have hereto affixed'my signature in the presence of two witnesses.

- BURT F. FRONEY.

Witnesses:

RoBT. H. KIRSOHMAN,

CHARLES A. NARA. 

